[Palm Treo 750 ROM Development] navenedrob:
Cannot get Hard-SPL on your Treo 750? Want to unlock/unbrand your Treo 750?

Check attached files to make your life easier.

Here is a guide to having a successful flash:

1) Create an ActiveSync connection with your phone.

2) THIS STEP IS ONLY FOR VISTA/WIN7 USERS! Follow the guide at this website first and complete all the instructions!

3) Download CheetahUnlocker to your computer, and extract the program - DO NOT RUN IT YET.

4) Download the attached Treo750UnlockFiles.zip and extract it to your computer. Take CHEEIMG.nbh and athena_unlocker.exe and copy them to your SD card.

5) Open/Run CheetahUnlocker.exe, and agree to the warning message. This will open a box with 3 options (2 are greyed out).

Option1:

Click "Flash SPL"

Click Next

Click the checkbox, then click Next

Click the checkbox (again), then click Next (again)

Click the "Update" button, then click Next

At this point CheetahUnlocker will send files to your phone to bypass the protection and flash your phone (called SSPL) and start your phone in bootloader mode. You may have to agree (on your phone) to these files being sent! Since we have placed the CHEEIMG.nbh file on your SD card CheetahUnlocker may respond with an error, ignore this error and click OK, it will go back to its original screen - DO NOT CLICK THE SECOND OPTION YET.

Your phone will find the CHEEIMG.nbh file on your SD card when entering bootloader mode and confirm that you would like to flash the file. Press the "Power/End Call" button to flash this file now, it should go rather quickly and say "Update Success" if all goes well.

After it is finished, pin reset your device using your stylus and the small button near the SD card slot. Your phone will boot up as normal, let it finish entering the OS and reconnect to ActiveSync.

Optional: Enter bootloader to confirm the flash by holding down the "Media" button (round button on left side) and using your stylus on the pin reset button (near the SD card slot) simultaneously. If all went well you should see SPL-1.4.0.OliNex.

Option 2:

Click "Unlock Radio"

Click the checkbox, then click Next

Click the "Update" button, then click Next

The program will flash an unlocked version of the radio to your phone. After it is finished it will boot normally, wait until it is done and has reconnected to ActiveSync. Around this time the program will prompt you with a box telling you it has to send files to your phone to unlock it, this will fail with an error. Click continue and the program will go back to its original screen. On your phone, locate the athena_unlocker.exe file on your SD card using File Explorer/Total Commander/Resco Explorer and RUN it. The program has 2 options, check both of these, then click "Unlock". This will unlock your phone, but we aren't done yet!

Option 3:

Press and hold "Shift" and "2" on your keyboard and click the title bar of CheetahUnlocker. This will unlock all 3 options. Click the 3rd option "Flash Normal Radio".

Click Next

Click the checkbox, then click Next

Click the checkbox (again), then click Next (again)

Click the "Update" button, then click Next

CheetahUnlocker will flash a normal working radio to your phone so that it operates normally. After it is finished, the phone will reboot and load as normal.

Congratulations, your Treo 750 (Cheetah) is now unlocked, unbranded, and ready to go!